The mouse different than all the others. It is quite an opinion but there are reasons. Need a proof? Let's see. If there was something like electronic genetics, this device would definitely be more popular. A4Tech’s specialists caused a real revolution with their SWOP-80. Those who know Logitech's products will agree with this sentence since it was Logitech's MX-5xx series that was the row model for the mouse tested. The shape, 8 buttons, colours, functions – those are only some similarities. The main difference is the manufacturer's logo ... and the price but we will talk about it later. Since the purpose of this review is to compare both models, let's get down to business and present the A4Tech Navigator Opto 518 SWOP-80.